p-Aminobenzenesulfonic acid was selected as a typical solute with amphoteric functional groups to be separated from dilute solution.A quaternary ammonium chloride,Aliquat 336, was used as the extractant. The effects of pH, extractant concentration and diluent types on distribution coefficient,D,were investigated. Meanwhile,the ion exchange reaction for Aliquat 336 with p-aminobenzenesulfonic acid in the extraction process was discussed.The description of D was proposed according to the mass action law.The results show that the D in non-polar diluents,kerosene and CCl4,is larger than that in polar diluent,1-octanol and chloroform.The sodium sulfate in aqueous phase affects D strongly due to exchange of sulfate ions with Aliquat 336. Finally,the removal of 4,4′-diaminostibene-2,2′-disulfonic acid (DSD) acid), an amino sulfonic acid,was successfully achieved from wastewater by the extraction with Aliquat 336.
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